Case report: TEN in a patient with black skin--blister fluid for rapid diagnosis.

Toxic epidermal necrolysis (TEN) is a rare, potentially life-threatening bullous drug reaction. Rapid diagnosis of TEN can lower the mortality rate when the offending drug is withdrawn immediately. Simple diagnostic tools such as cytology of skin blisters may be useful if rapid diagnosis is needed, in particular if standard histopathology service fails. An even faster bedside test for TEN in patients with black skin is color evaluation of skin blister fluid.